Erik Platt has joined Verso Advertising, Inc. as an account executive. Formerly he was a literary scout at Linda Clark Associates.

Susan Peterson has joined the executive team at codeMantra as senior v-p. Peterson was previously president of Blackwell Book Services.

At the Crown Publishing Group, Linnea Knollmueller has been promoted to v-p, director of production. Serena Sigona has been promoted to senior production manager, and Neil Spitkovsky has been promoted to prepress manager.

Marcie Lawrence joins Little, Brown Books for Young Readers as designer. Maggie Edkins has been promoted to assistant designer at the company.

Jeff Salane will be joining S&S as executive editor, effective August 25, leading the Little Simon team and taking over Sonali Fry’s former position. Salane was previously at Scholastic. Hannah Buchsbaum has been promoted to editor.